A peristaltic pump in which a tube is stably supported by a platen so as to be stably collapsed by fingers during normal operation, whereas, when an excessively large collapsing force is exerted by one of the fingers, the excess portion of the force is absorbed without fail so as to realize a stable...http://www.google.com.au/patents/US5211548?utm_source=gb-gplus-sharePatent US5211548 - Peristaltic pump having a motor overload protector
